<%@ page contentType="text/html;charset=utf-8" language="java" %>
<%--
    检查登录
    创建：Qizhan Lu
    日期：2011-11-11
--%>
<%
    Object logonSessionObj = session.getAttribute("_LOGONUSER_");
    if (logonSessionObj == null) {
%>
<script type="text/javascript">
    alert("操作超时，请重新登录！");
    window.location = "<%=request.getContextPath()%>/login.jsp";
</script>
<%
        return;
    }
    response.setHeader("pragma", "no-cache");
    response.setHeader("cache-control", "no-cache");
    response.setHeader("expires", "0");
%>